Dash Fan Resistor
If your front dash blower is not running in your 1980-1991 Vanagon, this resistor may likely be the cause. This aftermarket replacement resistor is for the blower motor to get that air movin'. Installation requires dash removal, so you might as well tend to the blower motor itself and the front heater core. Do it once, and do it right!
Make sure to bench test your resistor and motor before reassembling your dash!